Preservation of ecosystems

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Across
  1. 4. involving questions of right and wrong
  2. 5. prevention of wasteful use of a resource
  3. 10. A example of an NGO that helps preserve the environment
  4. 12. the variety of plant and animal life in the world or in a particular habitat, a high level of which is usually considered to be important and desirable.
  5. 13. the natural home or environment of an animal, plant, or other organism.
  6. 14. substances created by plants and animals that are poisonous to humans.
Down
  1. 1. is the introduction of harmful materials into the environment.
  2. 2. the surroundings or conditions in which a person, animal, or plant lives or operates
  3. 3. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.
  4. 6. a living thing
  5. 7. a large area covered chiefly with trees and undergrowth
  6. 8. maintain (something) in its original or existing state
  7. 9. non governmental organization
  8. 11. a biological community of interacting organisms and their physical environment